DFT Analysis of the Indium-Antimony-Vacancy Cluster in Silicon

Abstract:

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A cluster comprising of indium, antimony and a vacancy in silicon is analysed using the planewave pseudopotential technique. This cluster has a strong binding energy that inhibits indium diffusion after high temperature anneal cycles. Difficulties associated with the simulation of a vacancy using the supercell approach are initially highlighted. In comparison, the indium-antimony-vacancy cluster reveals stronger distortions and reduction in relaxation volume. The indium atom in the relaxed cluster shows nearly six-fold coordination whereas the antimony atom acquires four neighbours. Due to the low symmetry of the centre, in constrast to the isolated vacancy there is no propensity for a Jahn-Teller effect. It gives rise to two defect levels in the bandgap.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 245-246)

Edited by:

David J. Fisher

Pages:

29-38

DOI:

10.4028/www.scientific.net/DDF.245-246.29

Citation:

M.M. D. Souza and J. P. Goss, "DFT Analysis of the Indium-Antimony-Vacancy Cluster in Silicon", Defect and Diffusion Forum, Vols. 245-246, pp. 29-38, 2005

Online since:

October 2005

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Price:

$35.00

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